.btn {
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-default {
  text-shadow: 0 1px 0 #fff;
}

.btn-primary, .btn-success, .btn-warning, .btn-danger, .btn-info {
  text-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
}